Resolved Null Crash and Improved Hint Behavior in SfTextInputLayout

[Choza-rajan]

Root Cause of the Issue

The issue occurs due to a lack of null checks in the InputView's TextChanged event.

Description of Change

• Added null checks for the Text property using the null conditional operator to prevent crashes when the text is set to null.
• Ensure that when the text is set to null or empty, the hint state is updated correctly by setting IsHintFloated to false.

• Issues Fixed

Fixes #11

Screenshots

Before:

https://github.com/user-attachments/assets/f8b905e2-3253-45ff-b6b4-7615b9a9ef8f

After:

https://github.com/user-attachments/assets/ea1a92ef-54cf-49e5-b63d-836e5dd1e3eb

[PaulAndersonS]

/azp run

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